Ive spent so much time trying to figure this out. Luckily I have an IT friend and after 3 days of trying I can finally hear my company calls again with my bluetooth headphones. To fix this, you need to be in a teams call. You will not be able to hear anyone obviously but once are you in a call and the sound has cut off.
Go to bluetooth and devices
scroll down under related setting click on more devices and printer setttings.
It will then bring up a screen with your devices.
Click on your bluetooth headphones.
Click on the services tab.
Unselect (remove checkmark) from handsfree telephony.
Hit apply and ok
Your teams will now have sound!
I saw this fix but it did not work for me but I tried it as a last resort while in a teams call and that is what got me over the hump. YOU HAVE TO BE IN A TEAMS CALL FOR IT TO WORK